Telephone system



E. E. HINRlCHSEN.

TELEPHONE SYSTEM.

APPLICATION FILED MAY22.19|2.

Patented June 3, 1919.

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EDWARD E. HINRICHSEN, OF NEW YORK, N. Y., ASSIGNOR TO WESTERN ELECTRIC COMPANY, INCORPORATED, OF NEW YORK, N. Y., A CORPORATION OF NEW YORK.

TELEPHONE SYSTEM.

Specification of Letters Patent.

Patented June 3, 1919.

Application filed May 22, 1917. Serial No. 170,307.

To all whom it may concern: 7

Be it known that I, EDWARD E. HINRICH- a citizen of the United States, resid- SEN ing at New York, in the county of New York and State of New York, have invented certain new and useful Improvements in Telephone Systems, of which the following is a full, clear, concise, and eX- act description.

This invention relates to telephone systems, and more particularly to such systems of the measured service type.

The object of this invention is to provide a system of this character in which a message register or service meter will be positive in operation and will not be subject to such marginal operating conditions as have been experienced with message registers heretofore used, and in which the operation of the registeri will'not be affected by the variations in the other apparatus associated with the system in which the message register is included. 7

In accordance with a feature of this invention, an electromagnet associated with a telephone line is partially energized upon the connection of a link circuit with the line and is further energized upon the actuation of a switch associated with the link circuit to cause the operation of a message register whose electromagnet is included in a local circuit controlled by the first men tioned electromagnet.

For a more complete understanding of this invention reference should be had to the following description taken in connection with the drawing, wherein is shown so much of a telephone system as is necessary for the proper understanding of this invention.

In the drawing there is shown a telephone line A extending from a subscribers station to a central office at which is located a cord circuit for extending the telephone line A. There is shown in the drawing a line jack B in which another telephone line terminates. Associated with the line A is an ordinary line relay 5 controlling a line signal 6. There is also associated with the line A a cut-off relay 7 having two windings and which, when partially energized, attracts its left-hand armatures to disconnect the line relay 5 from the line and when fully or further energized attracts all of its armatures causing, the energization of an electromagnet 8 which, through its armature 9 and associated pawl 10 for engaging a ratchet wheel 11, actuates a message register M.

Subscriber A in initiating a call removes the receiver from the switchhook, causing the energization of the line relay 5, which attracts its armature to light the line lamp 6. The operator observing the condition of this line lamp 6 inserts answering plug 15 into line jack 16, thereby causing the partial energization of the cut-off relay 7 over a circuit from battery through answering supervisory lamp 17, resistance 18, sleeve contacts of the answering plug 15 and line jack 16, and the windings of cut-off relay 7 to ground. Since the receiver is off the switchhook, answering supervisory relay 19 will be energized, whereupon resistance 20 will be connected in parallel with the supervisory lamp 17, to eflt'ace the lamp. This partial energization of the cut-0E relay 7 causes the attraction of its left-hand armatures 21 and 22, thereby disconnecting the line relay 5 from the line circuit and effacing the line lamp 6.

The operator may now actuate a listening key (not shown) to connect the operators telephone set (also not shown) with the cord circuit. Upon being advised of the number of the telephone line with which connection is desired, for example, the line connected with line ack B, the operator restores the listening key to normal position and inserts calling plug 25 into line jack B. Calling supervisory lamp 28 is thereupon lighted. The subscriber connected with that line may be signaled in any desired manner. This called subscriber, in responding, causes the energization of calling supervisory relay 26, which connects resistance 27 in parallel with the calling supervisory lamp 28, thereby eifacing the lamp. The efiacement of this lamp indicates to the operator that the called subscriber has responded and is a signal that the call initiated by subscriber A may now be counted.

The operator counts the call by actuating a message register key 30, thereby completing a circuit from a message register battery 31, which is of higher voltage than the ordinary central office battery, through the when in circuit with both windings of the" cut-off relay, but does operate when included in circuit witlr thelcf-t hand winding only The completion of this circuit causes the further energization of cut-off relay 7, whereupon its right-hand armature 33 is attracted, completing an energizing circuit for the e'lectromagnet 8, which now attracts its armature to operate the message register M. Upon the attraction of the armature 9 by electromagnet 8 a contact is closed which establishes a short circuit for the right-hand winding of cutoil relay 7, thereby reducing the resistance in circuit with relay 32 and permitting the operation thereof. Relay 32in operating'completes a circuit for a lamp 34", which is lig'lited to indicate to the operator that the message reg ister has operated. The operator may now restore the key' 30 to normal, thereby reg moving the message register battery 31 and V relay 32 from the c'ircuit. The lamp" 34 is thereby eflaced. G ut-oil relay 7, however, does not release its armatures hut maina tain's' all three attiracted'. iVhile the cut-oil relay 7 will not attract its armature 33, when in circuit with: the usual central oflice battery, when once this armature is attracted, it is maintained in position hy' current from the usual central ofli'c'e' battery only;

The right-hai'i'd winding of cut-off relay 7 is of few turns compared to" the left-hand winding, so that the reduction in number'o'f turns caused by the ShOrt-circuiting of the right-hand winding is compensated for by the resulting increase of current through the left-hand winding a I H From this description it will be seen that by including,the'messageregister o e erating electromagnet ina local. circuit the Variations of resistance in other apparatus has less effect upon the operating margins of the message register magnet than when it is included in parallel or in series with'the cut-oil relay as has heretofore been-the practice: With no other apparatus inthe circuit with the message register magnet theoper at'ing conditions for that magnet are very much less'rigid than when other apparatus is included in the circuit.

That is claimed is g 1. A telephone system comprising a tele phone line, a service meter therefor, a link circuit for-extending the line, anelectr'm magnet partially ener ized upon connection of the'link'circuit' with the line; a switch actuated to furtherenergize the electremag= net, at second electromagnet energized upon the further energiz'ation of the first to actuate the service meter and-a circuit estab lished upon the operation of the second electroinagnet to maintain said first electromagnet energized;

2. A telephone system comprising a telephone line, a service meter therefor, a line signal fer the line, a link circuit for extending the line, a cut-ofi relay partially energizedx upon connection of the link circuit with the line to disconnect the signal therefrom, a switch actuated to further energize the cut-oil relay, an electromagnet energized upon the further energ ization of the cut-off relay to actuate thes'ervice meter and circuit. connections render-ed effective upon the operation of the electromagnet to maintain the cut-oh relay energized. A I

A telephone system comprising. a telephone line, a line relay therefor, a line signal actuated upon the energization of the line relay, a service meter for" the line, a link circuit for extending the line, a cut-off relay partially energized upon connection ofthe link circuit with the line to disconnect the line relaythere'frfom, a switch actua-ted to fu-rthenenergize' the cut-elf relay, an electromagnet energized upon the furtherenergization of thecutofi'i relay to actuate the service meter and means effective subsequent to the release of the switch to maintain the?cut-offv relay fully energize-d1 a. A telephone system; comprising a tele= line, a service met'er'therefor, afllink circuit forext'ending the line, a relay having a winding consisting of a plurality of turns, said relay being' artially energized upon the connection of the link cir uit with the line", a'sw'itch actuated to further ener gi'Ze the relay, an electromagnet energized upon the further energi zati'on' of the relay toactuatethe service'inet r, and a short Gir 105 cuit' for a portion of the turns of the wind ing of. said relay established u'ponthe ene'r gization of the electromagnet to thereby maintain the relay energized upon the release of the switch.

5'; A telephone system comprising'a telephone line, a service meter therefor, a line signal for the line, a link circuit for'ex tending the line", a' cut-ofi"relayhaving two windings and partially energized upon con= 115 nection of the link circuit with the line to disconnect the signal therefrom, a switch actuated to further energize thecut-oilre lay; an electromagnet' adapted when ener gizecl to actuatetheservicemeter, an ener 120 gizing circuit for the electromagnet includingla' contact'of the cut-off relay completed upon the further energization thereof, and a short circuit for'one winding of the cutoff" relay established upon the energization connection of the link circuit with the line,

a switch actuated to further energize' the cut-ofi relay, an electromagnet energized upon the further energization of the cut-off relay to actuate the service meter, and means effective upon the operation of the electromagnet to maintain the cut-oil relay operate 7. A telephone exchange system comprising a telephone line, a service meter therefor, a link circuit for extending the line, a cut-off relay partially energized upon the connection of the link circuit with the'line, a switch actuated to further energize the cutoil relay, an electromagnet energized upon the further energization of the cut-off relay to actuate the service meter, a signal in the link circuit, and a short circuit for a portion of the Winding of the cut-off relay for controlling the signal.

8. A telephone exchange system comprising a telephone line, a service metertherefor, a link circuit for extending the line, a cut-oil relay having two windings and partially energized upon the connection of the Copies of this patent may be obtained for five cents each, by addressing the Commissioner of Patents,

link circuit with the line, a switch actuated to further energize the cut-off relay, a signal in the link circuit, an electromagnet energized upon the further energization of the cut-oil relay to actuate the service meter, and a short circuit for one winding of the cut-ofi relay established upon the energization of the electromagnet for controlling the signal.

9. A telephone exchange system comprising a telephone line, a service meter therefor, a line relay, a link circuit for extending the line, a cut-off relay partially energized upon the connection of the link circuit with the line to disconnect the line relay therefrom, a switch actuated to further energize the cut-ofi relay, an electromagnet energized upon the further energization of the cut-off relay to actuate the service meter, a signal in the link circuit, and means operated upon the energization of the electromagnet to cause the illumination of the signal.

In witness whereof, I hereunto subscribe my name this 18th day of May A. D., 1917.

EDWARD E. HINRICHSEN.

Washington, D. 0. 

